Latch for carriage doors and the like



Nov. 1928. 1,690,655

' c. T. WEYMANN LATCH FOR CARRIAGE DOORS AND THE LIKE Filed NOV. 19, 1927 Patented Nov. 6, 1928 CHARLES TERRES WEYMA NN, OF PARIS, FRANCE,

ASSIGNOR 'lI'O VJEYMANNS MOTOR BODIES (1825) LIMITED, OF LONDON, ENGLAND, A. BRITISH COMPANY.

LATCH FOR CARRIAGE DOORS AND THE LIKE.

Application filed November 19, 1927,5eria1 No.

This invention comprises improvements in or relating to latches for carriage (particularly motor-car) doors and the like.

The invention relates to that type of latch in which the door is secured against the doorpost by means a keeper studcarried by one part (e. g. the door-post) and adapted to be received in an aperture provided by the other part (c. g. the door). In a latch of thistype the axis of the stud and aperture engagement lies in the direction of movement of the door to and from the door-post, and the stud when located. in the socket is secured against withdrawal by means of a detent entered transversely into the aperture to engage the stud.

The detent aforesaid is constrained by spring means towards its engaging position and the stud is formed with a tapered end adapted (when the door is moved to the closed position) to force the detentoutwardly of the aperture and so allow the stud to be pressed home, in which position the detent is forced by its spring into latching engagement with the stud.

Hitherto in door latches of the above type (see British Patent No.233,770) the sprin pressed detent has been in the form of a slid ing pin adapted to be inserted laterally into an aperture in the stud. y t

According to the present invention a door latch of the keeper stud and aperture type referred to is characterized in that the springpressed latching detent is mounted for pivotal movement transversely into and out of engagement with the stud, the stud being formed with a cooperating recess adapted to be engaged by the latch in the closed position of the door.

According to a feature of the invention the aforesaid recess in the stud is of annular or semi-annular formation and the detent has a concave edge shaped to engage over the reduced portion of the stud within the recess.

In one construction according to the inven tion the latching mechanism comprises in combination an aperture latch casing and detent mounted on the inside of the door, a.

keeper mounted on the door-post, an operating spindle for the detent extending to the outside of the door and there provided with a handle, and an operating arm carried by (for example formed integrally with.) the latch for operating the latter from the inside of the door. The above combination may also include a safety stop or dog accessible 234445, and in Great Britain war 22, 1926.

from the inside of the door and movable into engagement with a portion of the detentor with the operating member for the latter to prevent the detent being operated to free the keeper. i i v Some exam ales of the invention embodying the foregoing and other features thereof will now be described with reference to the ac-, companying drawings in which: i

Figure 1 is a perspective view showing the relative positions occupied by the keeper and latc casing members and associated parts when the door is about to be closed.

Figure 2 is a front elevation of, the latch mechanism with the cover removed.

Figure 3 is aview similar to Figure 2 and showing a modified form of dog.

Figure 4 is a section (to ascale larger than the preceding figures) at the line l-t in Figure 3 showing a modified form of keeper.

Like reference numerals indicate like parts throughout the figures.

The example illustrated in Figures 1 and 2 will first be described. The keeper stud 5 is taper-ended and is carried on a keeper 6 secured to the door-post. The aperture 7 toreceive the stud is formed in a member 8 secured to or formed integrally with a plate 9 which in turn is secured to. the inside face of the door in such a position that on the closingof the door the aperture 7 will register with the stud 5. The spring-pressed detent I hereinbefore referred to is a flat arm 10 which at one end is pivotally mounted at 11 on the plate 9 for swinging movement about an axis parallel with that of the aperture. The opposite end of the swinging detent works in a slot 12 in the member 8 and has an edgeportion 13 extending into the throughway of the aperture 7. The detent 10 is formed with a crank-arm 14 to which is connected a spring 15 arranged to constrain the detenttowards its latching position, that is towards'a position in which the edge-portion 13 extends into the aperture. The stud 5 is formed with an annular recess 16 in which the aforesaid edgeportion 13 of the detent is forced when the door is closed. The engaging edge 13 of the detent is of concave formation so that it fits over the reduced portion of the stud within the recess 16. The nose of the stud is rounded as shown so that as the stud enters the aperture 7 it readily pushes the detent 10 in an outwardly direction. When the stud has been pressed home and the door closed the detent is opposite'the recess 16 and is therefore forced by the spring to enter said recess thus latching the stud against withdrawal.

The unlatching mechanism for the detent comprises an operating spindle 17 which extends through the door and at its outer end is provided With a handle 18 Which may he manipulated from the outside of the door. The inner end of the spindle 17 is connected to a cam 38 which on partial rotation against the action of .a spring 19 is'adapted to engage andinove the detent 10 out of its latching po sition; In'o'rder that the door may also be unlatched from the inside, independently of operation of the spindle '17, the detent 10 is provided with an extended arm 20 fitted with a manipulating knob 21 accessible fromthe .inside of the door. As a safeguard against accidental opening of the door a pivoted dog 22 is arranged, for movement, from the in- .side of the door, into va position in which it abuts the crank-arm 14 of the detent and prevents movement of the latter in a direction to free the keeper stud. The member 8 and the latchnnechanism are enclosed by a dished cover 23' (as shown in Figure 1) whichis slotted at 2st and 25 to permitlof operation of the arm 20 and dog 22.

, Tnthe example illustrated in-Figure S the dog QQisarranged to engage the cam 38 instead ofthe crank-arm li asin theprevious example.

According to one feature of the invention as illustrated inFigui-e 4; the recess 16 in the keeper stud is tapered so that the mouth of the recess isgreater in idth than the thick ness of the detent 10, and the base 25 of the recess is narrower than the thickness of the detent. This arrangement ensures on the one hand that the detent even though slightly out of alignment with the centre of the recess'will readily enter the latter, and on the other hand that the detent when sprung home (as shown in Figure 4) Will bear on each side against the tapered walls of the recess and so prevent play and rattle.

According to a further feature of the in vention, also illustrated in Figure 4, the stud 5. is formed With a second recess 27 located near the nose of the stud and'adapted to be engaged by the detent 10 in a partially closed position of the door. This second recess 27 constitutes a safety device to ensure that even if tne door be only partially closed, it will be prevented from opening by virtue of the engagement of the detent 10 in the recess "27;

'inovable transversely of the stud for selective engagement with either of said recesses, an arm rigid with said detent, a spring engaging said arm to urge the'detent into engagement With the stud, a dog for engaging said arm to retain the latter in stud engaging position, and a second arm rigid With the de tent and extending outside of the latch casing for operating the detent. I

In testimony whereof I affix my signature.

CI iARLES TERRES WEY MANN.

the safety recess and 

